Control for an I.S. machine
AssigneeEmhart Glass S.A.
InventorJonathan S. Simon
Life of this patent
Estimating the term…
Abstract
A control for use with a glass forming machine which is controlled by a programmable sequencer which defines a machine cycle having a set cycle time. A computerized model of a mathematical representation of a network constraint diagram of the unwrapped bottle forming process is provided for determining whether, with the following inputs: the time in an unwrapped bottle forming process for each displacement to occur; the machine cycle time; the motion durations of each of the mechanisms from the retracted position to the advanced position and from the advanced position to the retracted position and the collision zones between interfering paths, a collision will result between the gob, the parison, the bottle or any mechanism.
Claims12
A control for use with a glass forming machine which includes a blank station for forming a parison from a gob of molten glass having a number of mechanisms, a blow station for forming a parison into a bottle having a number of mechanisms, a feeder system including a shear mechanism for shearing a gob from a runner of molten glass so that it can be delivered to the blank station, a mechanism for transferring a parison from the blank station to the blow station and a takeout mechanism for removing a bottle from the blank station,
- wherein the machine has a set cycle time,
- wherein each of the mechanisms is cycled within the time of one machine cycle,
- wherein each displacement of each of the mechanisms has a determinable duration,
- wherein interferences exist between the motion paths of the gob, the parison, the bottle and individual mechanisms,
- wherein at least one displacement of at least one of the mechanisms is divided up into at least two submotions which locates an interference with the gob, the parison, the bottle or another mechanism,
- wherein process air is supplied for at least one process for a finite duration by turning a supply valve “on” and then “off” during the time of one machine cycle,
- wherein the start of a displacement and the turning of a supply valve “on” and then “off” are controlled events which are started in a selected sequence, and
- wherein an unwrapped bottle forming process wherein a gob of molten glass is formed from a runner of molten glass, the gob is then formed into a parison in the blank station, the parison is then formed into a bottle in the blow station, and the bottle is then removed from the blow station, takes more than one machine cycle to complete, comprising
- a computerized model of a mathematical representation of a network constraint diagram of the unwrapped bottle forming process for determining whether, with the following inputs:
- 1. the time in an unwrapped bottle forming process for each displacement to occur;
- 2. the machine cycle time;
- 3. the motion durations of each of the mechanisms, and
- 4. the submotion durations,
- a collision will result between the gob, the parison, the bottle or any other mechanism.
A control for use with a machine which receives an initial product and transforms the initial product into a final product in a plurality of stations,
- wherein the machine has a set machine cycle time,
- wherein there is at least one mechanism at each station,
- wherein each of the mechanisms is displaced from an advanced position to a retracted position and from the retracted position back to the advanced position during the time of one machine cycle,
- wherein the duration of each displacement of each of the mechanisms is determinable,
- wherein the start of each displacement is an event which is selectively actuated in a selected sequence, and
- wherein the operation of the machine has a number of constraints including interferences which exist between the motion paths of individual mechanisms, the start and end times and the durations of displacement of the mechanisms,
- wherein an unwrapped process wherein the initial product is transformed into the final product takes more than the time of one machine cycle to complete,
- wherein the displacement of at least one of the mechanisms is divided up into at least two submotions which locates an interference, comprising
- a computerized model of a mathematical representation of a network constraint diagram of the unwrapped process for determining whether, with inputs including the following:
- 1. the time in an unwrapped process for each displacement to occur;
- 2. the machine cycle time;
- 3. the motion durations of displacement of each of the mechanisms, and
- 4. the submotion durations,
- a collision will result between any two mechanisms.
Dependencies are inferred from the claim text.